UPSEE 2019 Solved Paper

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Question : 128 of 150
 
Marks: +1, -0
The circles x2+y2+kx+4y=20 and x2+y2+6x−8y+10=0 intersect orthogonally. Also circles x2+y2−p(x−y)+1=0 andp(x2+y2)+x−y=l intersect orthogonally.
Then, k∕p equals
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